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Hi, Anonymous! You will know the remaining battery charge of the rechargeable battery by pressing the power button while the power is on. The indicator (red) flashes (1,2 or 3 times) and voice guidance indicating the remaining battery charge. For more details, check out this link: https://helpguide.sony.net/mdr/whch700n/v1/en/contents/TP0001613493.html. -Vincent
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